<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>了解iframe框架案例七</title>
	</head>
	<body>
	      <div style="text-align: center;width: auto;height: 150px;">
	      	<h1>论经济发展的可持续性</h1> 	
	      </div>
	      <iframe src="demo6.html" width="20%" height="500px" style="float: left;">
	      </iframe>
	      <iframe src="demo3.html" width="78%" height="500px" style="float: right;">
	      </iframe>
	</body>
</html>
